Question

Tyler simplified the expression

Answer 1

"Both powers should be in the denominator with positive exponents"

Explanation:

One rule of exponents is
`a^b=(1)/(a^-b)`

This means that the exponent changes sign when brought from numerator to denominator, or vice versa.

Looking at 2nd step of Tyler's work, we can see that he successfully used this rule with the exponent of x, but forgot to change the sign of the power of y to 9.

Since both the powers were negative when in the numerator, they should both be positive when taken to denominator. Hence, the correct answer is "Both powers should be in the denominator with positive exponents"